+1 for KenpoTex's comment
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The metal ones also give you the ability to rack the slide off your belt/pocket/boot when reloading or performing malfunction drills with one hand. Avoid ramped or "no snag" rear sights, they're worthless on a carry gun IMO.
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The only modification I've made to my Glock 20 is the factory night sights, three dots, took a little getting used to but they work just fine. I can see that somebody who was used to a different style of rear sight would get a little mixed up, in which case, using the Sharpie or a different rear is the way to go. In the end, do what works for you, it might take some trial & error.